Toshiba Tecra M4 Maintenance Manual page 80

2.4 System board Troubleshooting
Table 2-3 Debug port (Boot mode) error status (2/10)
D port status
F009h Saving key scan code
Setting TASK_1ms_TSC
Controlling fan
Initializing sound items (for
BEEP)
When BIOS, EC/KBC rewriting
is requested
When BIOS ROM is abnormal
When BIOS renewal is
prohibited
Key input
Reading CHGBIOSA.EXE /
CHGFIRMA.EXE
(F007h)
F100h Renewal of micro code (Model
supporting HTT)
Prohibition of cache
TECRA M4 Maintenance Manual (960-521)
Inspection items
[CONFIDENTIAL]
Details
Enabling system speaker
Releasing mute
Making the volume max
Blinks green (cycle:2s, on:1s, off:1s)
Blinks orange (cycle:2s, on:1s, off:1s)
Blinks 8 second cycle (On:4s, Off:4s). Beeps
30 second and halts Dport=F1BBh.
Temporary prohibition of USB
Beeps.
Waiting for key input
FDC reset
Setting parameters for 2HD(1.44MB)
Reading of first sector, If it is the data of
1.44MB (2HD), the media type is definite.
Setting of parameters for 2DD (720KB)
Retrieval of "CHGBIOSA.EXE" from the root
directory.
Calculation of directory start head and
sector
Read 1 sector of the root directory
Retrieval of entry of "CHGBIOSA.EXE"
/"CHGFIRMA.EXE" from the sector read.
Reading of EXE header of "CHGBIOSA.EXE"
and "CHGFIRMA.EXE"
Key input when error occurred.
Execution of "CHGBIOSA.EXE" and
"CHGFIRMA.EXE"
2 Troubleshooting
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